HASTELLOY® C-4 – W. Nr. 2.4610 / UNS N06455 / ASTM B575, B574, B622
HASTELLOY® C-4
HASTELLOY® C-4 is a highly corrosion-resistant nickel-chromium-molybdenum alloy designed for applications in aggressive chemical environments, particularly in the presence of hydrochloric acid, sulfuric acid, and chlorides.
Unlike other similar alloys, HASTELLOY® C-4 is microstructurally stable, meaning it can be welded without risk of sensitization and the formation of harmful secondary precipitates in welded joints.
This alloy exhibits excellent resistance to chloride stress corrosion cracking, as well as a remarkable ability to withstand both oxidizing and reducing environments, making it ideal for the chemical, pharmaceutical, and Oil & Gas industries.
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Reference standards:
- ASTM B575 (plates and strips)
- ASTM B574 (bars and wires)
- ASTM B622 (seamless pipes)
- ASTM B619 (welded pipes)
- ASTM B366 (fittings)
- DIN 17744 No. 2.4610 NiMo16Cr16Ti
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 65 min |
| Chromium (Cr) | 16.0 |
| Molybdenum (Mo) | 16.0 |
| Iron (Fe) | 3.0 max |
| Cobalt (Co) | 2.0 max |
| Manganese (Mn) | 1.0 max |
| Titanium (Ti) | 0.7 max |
| Carbon (C) | 0.01 max |
| Silicon (Si) | 0.08 max |
| Copper (Cu) | 0.5 max |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 768 | 416 | 52 |
| 400 | 706 | 403 | 49 |
| 600 | 675 | 371 | 52 |
| 800 | 656 | 320 | 64 |
Creep rupture strength (1000 h)
| Temperature (°C) | Creep rupture (MPa) |
|---|---|
| 649 | 270 |
| 704 | 220 |
| 760 | 165 |
| 816 | 120 |
| 871 | 72 |
| 927 | 44 |
| 982 | 25 |
Physical properties
- Density: 8.64 g/cm³
- Thermal conductivity: 10.1 W/m·K
- Young’s modulus: 212 GPa
- Electrical resistivity: 1.25 µΩ·m
- Thermal expansion (20-500°C): 13.2 µm/m·°C
Heat treatments
- Solution annealing: 1950°F (1066°C), with water or air cooling for thicknesses under 10 mm.
- Hot forming: Initial temperature 1177°C, final temperature 954°C.
- Cold forming: Requires high energy and may need intermediate annealing to avoid work hardening.
Available forms
HASTELLOY® C-4 is available in the following forms:
Industrial applications
Due to its high corrosion resistance and thermal stability, HASTELLOY® C-4 is used in the following sectors:
- Aerospace and Defense: Corrosion-resistant structural components.
- Power Generation: Components for chemical and nuclear plants.
- Chemical and Pharmaceutical Industry: Reactors, heat exchangers, and piping for highly aggressive environments.
- Motorsport: High-temperature resistant exhaust systems.
- Nuclear: Materials resistant to radiation and intergranular corrosion.
- Oil & Gas: Valves, fittings, and piping for environments containing hydrogen sulfide and aggressive acids.
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